<p>All calcualted:
<img alt="Falcon" height="81" src="falcon.png" width="100">
<p>Width calculated:
<img alt="Falcon" height="20" src="falcon.png" width="100">

<p>Height calculated:
<img alt="Falcon" height="81" src="falcon.png" width="20">
<p>Nothing calculated:
<img alt="Falcon" height="20" src="falcon.png" width="20">